libxrdp_force_read: error

Hi Folks

Recently I note the error from the xrdp service.

**●** xrdp.service - xrdp daemon 
   Loaded: loaded (/usr/lib/systemd/system/xrdp.service; enabled; vendor preset: disabled) 
   Active: **active (running)** since Thu 2022-04-14 20:00:19 CST; 1h 2min ago 
     Docs: man:xrdp(8) 
           man:xrdp.ini(5) 
 Main PID: 3073 (xrdp) 
    Tasks: 1 
   CGroup: /system.slice/xrdp.service 
           └─3073 /usr/sbin/xrdp --nodaemon 

Apr 14 21:03:12 EP-190-50.ep.NCTU.edu.tw xrdp[3073]: logging configuration: 
Apr 14 21:03:12 EP-190-50.ep.NCTU.edu.tw xrdp[3073]:         LogFile:       /var/log/xrdp.log 
Apr 14 21:03:12 EP-190-50.ep.NCTU.edu.tw xrdp[3073]:         LogLevel:      1 
Apr 14 21:03:12 EP-190-50.ep.NCTU.edu.tw xrdp[3073]:         EnableSyslog:  0 
Apr 14 21:03:12 EP-190-50.ep.NCTU.edu.tw xrdp[3073]:         SyslogLevel:   1 
Apr 14 21:03:12 EP-190-50.ep.NCTU.edu.tw xrdp[3073]: pub_mod bytes 256 
Apr 14 21:03:12 EP-190-50.ep.NCTU.edu.tw xrdp[3073]: pri_exp 256 
Apr 14 21:03:12 EP-190-50.ep.NCTU.edu.tw xrdp[3073]: libxrdp_force_read: error 
Apr 14 21:03:12 EP-190-50.ep.NCTU.edu.tw xrdp[3073]: xrdp_process_main_loop: libxrdp_process_incoming failed 
Apr 14 21:03:12 EP-190-50.ep.NCTU.edu.tw xrdp[3073]: xrdp_mcs_disconnect - socket closed


The system is trying to load “libxrdp_force_read” every 3 second, but keeping failed.
It seems harmless.
My xrdp is stilling working as expected.
But I still would like to learn what causes this error?
Any remarks would be appreciated.